My question is, "do you like your system or do YOU feel there is something missing or otherwise not right with the way it reproduces music?? If the answer is yes, can you isolate the component responsible? Rather than just add stuff willy-nilly(I always wanted to write that) first find out if there is a problem, what the problem is and then try and identify the source. Components don't "add" anything. There is the information recorded on the source material such as a cd or an album. That information can be retrieved by your components but it can't be "added" to. The information that's there is the information that's there. The only thing tubes will do is add a type of distortion that I guess your listeners think would nicely counteract soem other type of distortion they are hearing and don't like.
Nick
Nick